All good ideas - but I went for simplicity and functionality over any advanced features.
I may add some magnets. Most commercially available plastic and aluminium jaws use them.
Pure Teflon/PTFE is
fairly inexpensive to get - I have paid 10€ incl. shipment for a 10 x 10 cm² piece with 10mm thickness.
I have also thought about dowel pins, but I have skipped the idea as the design is sufficient for my use cases. Not every workshop has the tools for the required precision work.
Admittedly, not every workshop has a miter saw and a drill press, which I had used. Alternatively, one could surely use a router for cutting the lip and a different saw to cut the work piece.
I'd be glad to see improved versions build by other members, of course!
![Cool 8)](https://www.eevblog.com/forum/Smileys/default/xcool.gif.pagespeed.ic.cOxV6sPNRd.png)
Just keep them coming...
Cheers,
THDplusN_bad